Allen and Jolivette—Light Reactions of Pilobolus. 597 
tained in the experiments with the single lights of different 
colors, in which it was found that, as in the present case, the 
sporanges were aimed much more accurately toward the blue 
than toward the yellow light. 
When either white or blue light was used simultaneously 
with red, the ratio was 12 to 1 in favor of the white or blue 
light. This also agrees with the results of the previous experi¬ 
ments which tested, the accuracy of aim of Pilobolus toward 
single lights. 
We wish to thank I)r. R. A. Harper and Dr. C. E. Allen of 
the University of Wisconsin for their suggestions and criticisms 
in the writing of this paper. 
Bibliography. 
1. Albrecht, G.: fiber die Perzeption der Liehtrichtung in 
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3. -: Pilobolus. Ibid, 4:60-97. 1881. 
4. -: Die Bedeutung des Lichtes fur die Entwickelung 
einiger Pilzformen. Ibid, 8: 275-290, 1889. 
5. Dandeno, L B.: Phototropism under light-rays of differ¬ 
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6. Elfving, L.: Studien iiber die Einwirkung des Lichtes auf 
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